Oscillations and Waves (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 156 - 160 of 195

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Question number: 156

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A whistle giving out 461 Hz approaches a stationary observer at a speed of 44 m/s. The frequency heard by the observer in Hz is

Choices

Choice (4) Response

a.

545 Hz

b.

550 Hz

c.

532 Hz

d.

430 Hz

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Question number: 157

» Oscillations and Waves » Beats

MCQ▾

Question

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 5 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observed

Choices

Choice (4) Response

a.

8

b.

4

c.

16

d.

10

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Question number: 158

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A source of sound and a listener are moving towards each other with a speed Equation of the speed of sound. If the frequency of the note emitted by the source is f, the frequency of the note heard by the listener will be nearly:

Choices

Choice (4) Response

a.

1.20 f

b.

2.0 f

c.

2.20 f

d.

1.18 f

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Question number: 159

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A police car moving at 22 m/s, chases a motorcyclist. The police man sounds his horn at 180 Hz, while both of them move towards a stationary siren of frequency 162 Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats

Choices

Choice (4) Response

a.

33 m/s

b.

22 m/s

c.

Zero

d.

28.7 m/s

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Question number: 160

» Oscillations and Waves » Harmonics

MCQ▾

Question

The loudness and the pitch of a sound depends on

Choices

Choice (4) Response

a.

Intensity and frequency

b.

Frequency and velocity

c.

Intensity and velocity

d.

Frequency and number of harmonics

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